I have small script, abc.ksh that takes 3 parameter e.g abc.ksh ${a} ${b} ${c}

I will read from a config file with 'n' no of entires and I will execute abc.ksh 'n' times in parallel using a for loop. E.g

export pids=()
for file in `cat config.txt`
    a=`echo ${file}|awk -F"|" '{ print $1 }'`
    b=`echo ${file}|awk -F"|" '{ print $2 }'`
    c=`echo ${file}|awk -F"|" '{ print $3 }'`   
    nohup ksh abc.ksh ${a} ${b} ${c} &

Next, I need to check the completion of each job(based on the pid) and perform the next action item for that particular job. E.g

export cnt=0
while[ $cnt -eq `wc -l config.txt`]; do
  export tmp=()
  for p in ${pids[*]}; do
    if[[ ! -d /proc/${p} ]]; then
      wait ${p}
      echo "Process completed with Process ID ${p}; exit code: $?"
      if [[ $? -eq 0 ]]; then
        cnt=`expr $cnt + 1`
        ***<Need to get the executed command "
        nohup ksh abc.ksh {a} {b} {c}" for the successfully completed PID>.***
      echo "Process with Process ID ${p} Still running."
  pids+=( ${tmp[*]})

How can I get that?

  • 2
    You'd need to have other arrays to track the parameters for each pid in the same order. – Julie Pelletier May 13 '16 at 20:32
  • 1
    Please show a sample of your config.txt. There's probably a much easier way to do this, possibly involving perl or python (i.e. this looks like a possible XY problem to me) – cas May 14 '16 at 3:37
  • Your script has syntax errors; [ and [[ require surrounding spaces. – Wildcard Sep 22 '17 at 1:00

I will not comment too much on the structure or contents of the script other than noticing that you are putting the PIDs into the pids array in a sequential manner.

You are then waiting on these same PIDs is the same order.

This means that the command that you wait for in step n of the loop will be using the parameters on line n of config.txt.

The only thing that would cause problems are your forays into the /proc filesystem. This is not needed. You also need to check the condition on the outer loop ($cnt will not be equal to the number of lines in the config.txt file on the first iteration, for example).

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